Title:
LOCKUP CONTROL DEVICE OF AUTOMATIC TRANSMISSION
Document Type and Number:
Japanese Patent JP2019158056
Kind Code:
A
Abstract:
To suppress a rise of the rotation of a traveling drive source when fastening a lockup clutch, and to reduce a change of a behavior of a vehicle at the fastening while shortening a time necessary for the fastening.SOLUTION: A lockup control device of an automatic transmission comprises a torque converter 4 arranged between an engine 1 and a continuously variable transmission 6, and having a lockup clutch 3. The lockup control device also comprises a lockup control part 12c for increasing an LU-indication pressure difference by a prescribed ramp gradient after raising the LU-indication pressure difference up to an initial pressure difference, and fastening the lockup clutch 3 when a lockup fastening condition is established when the lockup clutch 3 is in a release state. The lockup control part 12c sets the initial pressure difference at a value which is obtained by subtracting a ramp offset C calculated according to the ramp gradient from a learning value A of a meet-point indication pressure difference at which the lockup clutch 3 starts to possess a lockup capacity.SELECTED DRAWING: Figure 4
Inventors:
ARAKI TOSHIMITSU
YAMADA TAKAHIRO
IIIZUMI TAKEHIRO
YAMADA TAKAHIRO
IIIZUMI TAKEHIRO
Application Number:
JP2018047542A
Publication Date:
September 19, 2019
Filing Date:
March 15, 2018
Export Citation:
Assignee:
JATCO LTD
NISSAN MOTOR
NISSAN MOTOR
International Classes:
F16H61/14
Domestic Patent References:
| JP2000213642A | 2000-08-02 |
Foreign References:
| WO2017033760A1 | 2017-03-02 |
Attorney, Agent or Firm:
Cleo International Law & Patent Office